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Evidence of early childhood as the susceptibility period in multiple sclerosis: space-time cluster analysis in a Sardinian population

Pugliatti, Maura and Riise, Trond and Sotgiu, Maria Alessandra and Satta, Wanda Maria and Sotgiu, Stefano and Pirastru, Maria Immacolata and Rosati, Giulio (2006) Evidence of early childhood as the susceptibility period in multiple sclerosis: space-time cluster analysis in a Sardinian population. American Journal of Epidemiology, Vol. 164 (4), p. 326-333. eISSN 1476-6256. Article.

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DOI: 10.1093/aje/kwj190

Abstract

The authors analyzed the natural history of multiple sclerosis (MS) before onset to identify the period of susceptibility and exogenous factors that might play a role in causing the disease. Space-time cluster analysis was performed among northern Sardinians, a genetically stable Italian population that showed an increasing risk of MS between 1965 and 1999. Residence changes from birth to clinical onset were recorded for all MS patients with clinical onset between 1965 and 1999 in the province of Sassari. Closeness in space and time was defined as living in the same municipality and differing in year of birth by 1, 2, or 5 years. Analyses were performed for the period from birth to age 25 years or MS onset and in demographic and clinical subgroups. Clustering was substantial in early childhood. Clustering was most marked in the most recent cases, among women, and among patients with early age at onset, a relapsing-remitting course, and in the eastern subarea. No clustering was found when closeness in time was defined as a fixed number of years before onset, which argues against a fixed latency period. Early childhood seemed to be a period of increased susceptibility to MS. This evidence and the increasing incidence of MS in northern Sardinia are compatible with a change in environmental exposure.

Item Type:Article
ID Code:266
Status:Published
Refereed:Yes
Uncontrolled Keywords:Child, cluster analysis, Italy, multiple sclerosis
Subjects:Area 06 - Scienze mediche > MED/26 Neurologia
Divisions:001 Università di Sassari > 03 Istituti > Clinica neurologica
Publisher:Oxford University Press
eISSN:1476-6256
Copyright Holders:© 2006 by the Johns Hopkins Bloomberg School of Public Health
Additional Information:Pubblicato online il 5 giugno 2006.
Deposited On:18 Aug 2009 10:01

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